Units of Measurement - Mayo Clinic Laboratories

Units of Measure A list of common units used in the reporting of our assays has been defined. Refer to the table for these units as well as the recommended report abbreviations. Last updated: June 6, 2025...

APOEG - Overview: Apolipoprotein E Genotyping, Blood

Determining the specific apolipoprotein E (APOE) genotypes in individuals with type III hyperlipoproteinemia Determining the specific APOE genotypes that may increase risk for amyloid related imaging abnormalities in individuals being...

HBIM - Overview: Hepatitis B Virus Core IgM Antibody, Serum

Diagnosis of acute hepatitis B virus (HBV) infection Identifying acute HBV infection in the serologic window period when HBV surface antigen and HBV surface antibody results are negative Differentiation between acute, chronic, or past...

HPGLP - Overview: Hereditary Paraganglioma/Pheochromocytoma Panel, Varies

Evaluating patients with a personal or family history suggestive of a hereditary paraganglioma and pheochromocytoma (PGL/PCC) syndrome Establishing a diagnosis of a hereditary PGL/PCC, allowing for targeted surveillance based on...

HTG2 - Overview: Thyroglobulin, Tumor Marker, Serum

Follow-up of patients with differentiated thyroid cancers after thyroidectomy and radioactive iodine ablation

PMPDD - Overview: PMP22 Gene, Large Deletion/Duplication Analysis, Varies

Diagnosis of Charcot-Marie-Tooth type 1A or hereditary neuropathy with liability to pressure palsies

DPYDQ - Overview: Dihydropyrimidine Dehydrogenase Genotype, Varies

Identifying individuals with genetic variants in DPYD who are at increased risk of toxicity when prescribed 5-fluorouracil (5-FU) or capecitabine chemotherapy treatment

TRBC3 - Overview: T-Cell Receptor Constant Beta Chain (TRBC1) +CD3 Immunostain, Technical Component Only

Determination of T-cell clonality in T-cell neoplasms

TRBC1 - Overview: T-Cell Receptor Constant Beta Chain (TRBC1) Immunostain, Technical Component Only

Determination of T-cell clonality in T-cell neoplasms

ALPI - Overview: Alkaline Phosphatase Isoenzymes, Serum

Aid in the diagnosis and treatment of liver, bone, intestinal, and parathyroid diseases Determining the tissue source of increased alkaline phosphatase (ALP) activity in serum Differentiating between liver and bone sources of elevated...

FENTS - Overview: Fentanyl, Serum

Monitoring fentanyl therapy

HGEMS - Overview: Hydroxyglutaric Acids, Glutaric Acid, Ethylmalonic Acid, and Methylsuccinic Acid, Serum

Evaluation of patients with an abnormal newborn screen showing elevations of glutarylcarnitine (C5-DC) using serum specimens Evaluation of patients with abnormal newborn screens showing elevations of C4- acylcarnitine to aid in the...

CORAB - Overview: Hepatitis B Virus Core Total Antibodies, with Reflex to Hepatitis B Virus Core IgM Antibody, Serum

Detection and differentiation between recent, past/resolved, or chronic hepatitis B Diagnosis of recent hepatitis B virus (HBV) infection during the "window period" when both hepatitis B surface (HBs) antigen and anti-HBs are negative...

CTSU - Overview: Ceramide Trihexosides and Sulfatides, Random, Urine

Identifying patients with Fabry disease Identifying patients with metachromatic leukodystrophy Identifying patients with saposin B deficiency Identifying patients with multiple sulfatase deficiency Identifying patients with...

ALKP - Overview: Alkaline Phosphatase, Total and Isoenzymes, Serum

Aid in the diagnosis and treatment of liver, bone, intestinal, and parathyroid diseases Determining the tissue source of increased alkaline phosphatase (ALP) activity in serum Differentiating between liver and bone sources of elevated ALP

LUCHM - Overview: LiquidHALLMARK ctDNA and ctRNA

As an alternative to invasive tissue biopsies to assist in tumor profiling for diagnosis, predicting prognosis, and identifying targeted therapies for the treatment and management of patients with a solid tumor This test is not useful for...

COKEM - Overview: Cocaine and Metabolites Confirmation, Meconium

Detecting in utero drug exposure up to 5 months before birth

UIOD - Overview: Iodine, 24 Hour, Urine

Assessing iodine toxicity or recent exposure in a 24-hour urine collection Monitoring iodine excretion rate as index of replacement therapy

MPSQU - Overview: Mucopolysaccharides Quantitative, Random, Urine

Supporting the biochemical diagnosis of one of the mucopolysaccharidoses: types I, II, III, IV, VI, or VII

ARSU - Overview: Arylsulfatase A, 24 Hour, Urine

Detection of arylsulfatase A deficiency using urine specimens This test is not suitable for carrier detection.

ARSAW - Overview: Arylsulfatase A, Leukocytes

Preferred enzymatic test for detection of arylsulfatase A deficiency This test is not suitable for carrier detection.

PSHIV - Overview: HIV-1 RNA Patient Source, Plasma

Detection and diagnosis of HIV-1 infection in an acutely or early infected individual (including infants of <2 years of age) who is the source of blood or body fluid in an occupational exposure event

COKMX - Overview: Cocaine and Metabolite Confirmation, Chain of Custody, Meconium

Detecting in utero drug exposure up to 5 months before birth Chain of custody is required whenever the results of testing could be used in a court of law. Its purpose is to protect the rights of the individual contributing the specimen by...

ARSAB - Overview: Arylsulfatase A, Blood Spot

Second-tier newborn screening test for metachromatic leukodystrophy (MLD) when sulfatides are elevated Enzymatic test for detection of arylsulfatase A deficiency This test is not suitable for carrier detection.

3A4Q - Overview: Cytochrome P450 3A4 Genotype, Varies

Aids in determining therapeutic strategies for drugs that are metabolized by cytochrome P450 3A4, including quetiapine This test is not useful for managing patients receiving fluvastatin, rosuvastatin, or pravastatin since these drugs are...

PLP - Overview: Pyridoxal 5-Phosphate, Plasma

Determining vitamin B6 status, including in persons who present with progressive nerve compression disorders, such as carpal tunnel and tarsal tunnel syndromes Determining the overall success of a vitamin B6 supplementation...

CDKZ - Overview: CDKN1C Gene, Full Gene Analysis, Varies

Confirming a clinical diagnosis of Beckwith-Wiedemann syndrome following a normal result on methylation analysis Confirming a clinical diagnosis of IMAGe (intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia...

OLIGU - Overview: Oligosaccharide Screen, Random, Urine

Screening for selected oligosaccharidosis

B6PRO - Overview: Vitamin B6 Profile (Pyridoxal 5-Phosphate and Pyridoxic Acid), Plasma

Determining vitamin B6 status, including in persons who present with progressive nerve compression disorders, such as carpal tunnel and tarsal tunnel syndromes Determining the overall success of a vitamin B6 supplementation program...

MTHX - Overview: Methotrexate, Serum

Determining whether methotrexate is being cleared appropriately and verifying that a nontoxic concentration has been attained following therapy

HBVQN - Overview: Hepatitis B Virus (HBV) DNA Detection and Quantification by Real-Time PCR, Serum

Detection and quantification of hepatitis B virus (HBV) DNA in serum of patients with chronic HBV infection (ie, hepatitis B surface antigen-positive) Monitoring disease progression in chronic HBV infection Monitoring response to anti-HBV...

IDHQ - Overview: IDH1 (R132) and IDH2 (R140 and R172) Quantitative Detection, Droplet Digital PCR, Varies

Detecting IDH1 R132 and IDH2 R140 and R172 mutations in acute myeloid leukemia patients at the time of diagnosis to guide targeted therapy Monitoring minimal residual disease during the clinical and therapeutic course

HIQNP - Overview: HIV-1 RNA Detection and Quantification, Prenatal, Plasma

Diagnosis of HIV-1 infection in pregnant individuals with acute or early HIV-1 infection Quantifying plasma HIV-1 RNA levels (viral load) in pregnant individuals living with HIV-1: -Before initiating anti-HIV-1 drug therapy (baseline viral...

IOD - Overview: Iodine, Serum

Determining iodine overload using serum specimens Monitoring iodine levels in individuals taking iodine-containing drugs

U1A1Q - Overview: Uridine Diphosphate (UDP) Glucuronosyltransferase 1A1 TA Repeat Genotype, UGT1A1, Varies

Identifying individuals who are at increased risk of adverse drug reactions with drugs that are metabolized by uridine diphosphate glucuronosyltransferase (UGT1A1); especially irinotecan but also atazanavir, nilotinib, pazopanib, and...

HGEMP - Overview: Hydroxyglutaric Acids, Glutaric Acid, Ethylmalonic Acid, and Methylsuccinic Acid, Plasma

Evaluation of patients with an abnormal newborn screen showing elevations of glutarylcarnitine (C5-DC) using plasma specimens Evaluation of patients with abnormal newborn screens showing elevations of C4- acylcarnitine to aid in the...

ADULT - Overview: Adulterants Survey, Random, Urine

Assessment of possible adulteration of a urine specimen submitted for drug of abuse testing Providing the creatinine concentration for normalization purposes

C2AD2 - Overview: PrecivityAD2, Plasma

Assisting in the evaluation of adult patients, aged 55 years and older, with signs or symptoms of mild cognitive impairment or dementia who are being assessed for Alzheimer disease and other causes of cognitive decline This is not...

HGEM - Overview: Hydroxyglutaric Acids, Glutaric Acid, Ethylmalonic Acid, and Methylsuccinic Acid, Blood Spot

Evaluation of patients with an abnormal newborn screen showing elevations of glutarylcarnitine (C5-DC) using dried blood spot specimens Evaluation of patients with abnormal newborn screens showing elevations of C4-acylcarnitine to aid in...

NGSFX - Overview: Reanalysis of Acute Myeloid Leukemia 4- or 11- Gene Panels, Additional Genes

Comprehensive reanalysis of a larger set of genes/gene regions when a more targeted gene panel was previously performed in this laboratory Evaluation of known or suspected hematologic neoplasms, specifically of myeloid origin (eg, acute...

ADLTX - Overview: Adulterants Survey, Chain of Custody, Random, Urine

Assess the possible adulteration of a urine specimen submitted for drug of abuse testing Providing the urine creatinine concentration for normalization purposes Chain of custody is required whenever the results of testing could be used...

HIVQN - Overview: HIV-1 RNA Detection and Quantification, Plasma

Quantifying plasma HIV-1 RNA levels (viral load) in individuals living with HIV-1: -Before initiating antiretroviral therapy to obtain baseline viral load -Who may have developed HIV-1 drug resistance while on antiretroviral therapy -Who...

HIVDR - Overview: HIV-1 Genotypic Drug Resistance to Reverse Transcriptase, Protease, and Integrase Inhibitors, Plasma

Identifying HIV-1 genotypic mutations associated with resistance to nucleotide and non-nucleoside reverse-transcriptase inhibitors, protease inhibitors, and integrase strain transfer inhibitors Guiding initiation or change of combination...

PANGP - Overview: Expanded Pancreatitis Gene Panel, Varies

Confirmation of suspected clinical diagnosis of familial or hereditary pancreatitis in patients with chronic pancreatitis Identification of gene variants contributing to pancreatitis in an individual or family Identification of gene...

SCOF4 - Overview: Severe Acute Respiratory Syndrome Coronavirus 2 (SARS CoV-2), Influenza Virus Type A and Type B RNA, and Respiratory Syncytial Virus (RSV) Molecular Detection, PCR, Varies

Simultaneous detection and differentiation of SARS-CoV-2 (cause of COVID-19), influenza A virus, influenza B virus, and respiratory syncytial virus in upper or lower respiratory tract specimens from individuals with flu-like illnesses

AD2AR - Overview: PrecivityAD2, Reflex to Apolipoprotein E, Plasma

Assisting in the evaluation of adult patients, aged 55 years and older, with signs or symptoms of mild cognitive impairment or dementia who are being assessed for Alzheimer disease and other causes of cognitive decline Determining APOE E4...

CHOU - Overview: Carbohydrate, Urine

Screening for conditions associated with increased excretion of carbohydrates, including inborn errors of fructose and galactose metabolism. This test is not recommended as a follow up test for abnormal newborn screening for galactosemia.

OROT - Overview: Orotic Acid, Random, Urine

Evaluation of the differential diagnosis of hyperammonemia and hereditary orotic aciduria Sensitive indicator of ornithine transcarbamylase (OTC) activity after administration of allopurinol or a protein load to identify OTC carriers

MEVI - Overview: Methemoglobinemia Interpretation

Interpretation of the methemoglobinemia evaluation results Diagnosis of methemoglobinemia and sulfhemoglobinemia and possible hereditary (congenital) causes Differentiation of methemoglobinemia and sulfhemoglobinemia from other causes of...

IODCU - Overview: Iodine/Creatinine Ratio, Random, Urine

Assessment of iodine toxicity or recent iodine exposure using a random urine collection Monitoring iodine excretion rate as index of replacement therapy