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Test Code LAB4133 B12 & FOLATE

Important Note

Protect from light.

Vitamin B12 determinations should be performed on serum samples from fasting patients.

Specimen Type

 Preferred Specimen: Lithium Heparin Plasma (Mint/Light Green Top Tube) 

Alternate Specimen: Serum (SST, Gold, Corvac, Tiger, Red Top Tube)

Specimen Volume

1 mL

Minimum Volume

0.5 mL

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

Refrigerated: 7 days

Method

Immunoassay

Reference Ranges

Vitamin B12 (pg/mL):

Age Range
0 up to 5 days None established
5 days up to 1 year 259 - 1,576
1 year up to 9 years 283 - 1,613
9 years up to 14 years 252 - 1,125
14 years up to 17 years 244 - 888
17 years up to 19 years 203 - 811
19 years and older 213 - 816

Folate (ng/mL):

Age Range
0 up to 5 days None established
5 days up to 1 year >10.5
1 year up to 3 years >3.8
3 years up to 6 years >11.8
6 years up to 8 years >13.0
8 years up to 12 years >11.3
12 years up to 14 years >11.8
14 years up to 19 years >7.8
19 years and older 7.0 - 31.4

Synonyms

Vitamin B12/Folate; Vitamin B12/Folic Acid

Test Components

B12, pg/mL;

Folate, ng/mL.

CPT Codes

82607, 82746