Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

BETA-HYDROXYBUTYRATE

General Information

Lab Order Codes:

BHBB

Synonyms:

B-hydroxybutyrate; Hydroxybutyrate, Beta; Ketone Bodies; BHB

CPT Codes:

82010 – Acetone or other ketone bodies, serum; quantitative

Test Includes:

Beta-Hydroxybutyrate level reported in mmol/L.

Logistics

Test Indications:

Useful for diagnosis and monitoring of therapy for diabetic ketoacidosis and for any patient presenting to the emergency room with documented hypoglycemia, acidosis, alcohol ingestion or an unexplained increase in the anion gap.

In pediatric patients, the presence or absence of ketonemia/uria is an essential component in the differential diagnosis of inborn errors of metabolism.

Serum Beta-Hydroxybutyrate is a key parameter monitored during controlled 24-hour fasts when indicated.

Lab Testing Sections:

Chemistry (All testing performed on the St. Paul campus)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

4 hours

Special Instructions:

N/A

Specimen

Specimen Type:

Blood

Container:

Green (Li heparin) or Red top tube

Draw Volume:

1.5 mL (Minimum: 0.6 mL) blood

Processed Volume:

0.5 mL (Minimum: 0.2 mL) plasma/serum

Collection:

Routine venipuncture

Special Processing:

Lab Staff: Centrifuge specimen, remove plasma/serum aliquot into a plastic sample cup. Analyze immediately, or ship at 2-8 degrees C.

Minneapolis Lab Staff: Forward sample immediately at refrigerated temperature to the St. Paul lab.

Patient Preparation:

The reference range was established on patients fasting for 9-12 hours prior to collection.

Sample Rejection:

Mislabeled or unlabeled specimens

Interpretive

Reference Range:

<0.27 mmol/L

Interpretation: The BHB/acetoacetate ratio is typically between 3:1 and 7:1 in severe ketotic states. Serum BHB increases in response to fasting, but should not exceed 0.27 mmol/L following an overnight fast (up to 12 hours). In pediatric patients, a hypo- or hyper-ketotic state (without hypoglycemia) may suggest specific groups of metabolic disorders.

Critical Values:

N/A

Limitations:

24-hour fasting tests should not be performed in patients <2 years old.

Dipstick serum ketone determination using nitroprusside reagent is often used to estimate ketone body status, but that method has inherent problems. The dipstick does not measure BHB, the most abundant of the physiological ketone bodies; the nitroprusside reagent only reacts with acetoacetate and acetone.

Methodology:

Photometric, B-Hydroxybutyrate Dehydrogenase (B-HBDH)

References:

Stanbio Laboratory B-hydroxybutyrate LiquiColor Procedure # 2440 (02/04/2009) modified for Siemens Dimension RxL open channel, 1261 North Main Street, Boerne, TX 78006

Sena, Salvador F (7/2010) Technically Speaking, Danbury Hospital Department of Pathology and Laboratory Medicine, Vol 4, No. 8

Mayo Medical Laboratories (1/2012) online test catalogue

Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp, Inc, Hudson, OH, 5th Edition, p.205

Updates:

2/21/2012: Testing moved from Mayo Medical Laboratories to an inhouse test at Children’s laboratory.



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