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Test Code VITK1 Vitamin K1, Serum

Important Note

Submit specimen in a Mayo amber tube to protect from light.

Additional Codes

Epic Ordering Code LAB3041959
NBS code LBC11819
Service code 37151

Reporting Name

Vitamin K1, S

Specimen Type

Serum


Shipping Instructions


Ship specimen in amber vial or wrapped to protect from light.



Specimen Required


Patient Preparation:

Fasting: 12 hours, required; Infants should have specimen collected before next feeding

Supplies: Amber Frosted Tube, 5 mL (T915)

Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Amber vial

Specimen Volume: 2 mL Serum

Collection Instructions:

1. Within 2 hours of collection, centrifuge the specimen.

2. For red-top tubes:
Preferred: Immediately aliquot serum into an amber or light-protected plastic vial.

Acceptable: Serum may be on whole blood cells a maximum of 2 hours before aliquoting. Protect the collection tube from light.

3. For serum-gel tubes:

Preferred: Immediately aliquot serum into an amber or light-protected plastic vial.

Acceptable: Serum may be aliquoted into an amber or light-protected plastic vial within 24 hours of collection when kept at ambient temperature and protected from light or within 7 days of collection if kept refrigerated and protected from light.


National University Hospital-Singapore Note:

NUH Outreach Laboratories:
Specimen Requirements
Submit only one of the following:
Preferred: Red Top
Acceptable: Yellow Top
Fasting: 12 hours, required; Infants should have specimen collected before next feeding

Processing Requirements
Centrifuge and aliquot serum into a Mayo amber tube within 2 hours of collection. Protect from light.
Specimen type: Serum
Volume: 2 mL
Storage/transport requirements: Refrigerated

Forms

If not ordering electronically, complete, print, and send a General Request (T239) with the specimen.

Specimen Minimum Volume

Serum: 0.75 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 14 days
  Frozen  30 days
  Ambient  24 hours

Reject Due To

Gross hemolysis OK
Lipemia Reject
Gross icterus OK

Method Name

Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

Day(s) Performed

Monday through Friday

Report Available

2 to 5 days
National University Hospital-Singapore Note:

Please note that this is a referral test requiring transport to the external testing facility and an additional 3-5 days is required.

Reference Values

<18 years: Not established

≥18 years: 0.10-2.20 ng/mL

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful For

Assessment of circulating Vitamin K1 concentration

CPT Code Information

84597

LOINC Code Information

Test ID Test Order Name Order LOINC Value
VITK1 Vitamin K1, S 9622-2

 

Result ID Test Result Name Result LOINC Value
62167 Vitamin K1, S 9622-2

Secondary ID

42364

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.
National University Hospital-Singapore Additional Information:

Last updated 18/08/2026