Homocysteine

Interpretation

Method

Enzymatic

Reference Ranges

(individual methods listed below)

Default Method

Units: mcmol/L

Female		Male		Unknown
Age	Range	Age	Range	Age	Range
0-	0-16	0-	0-16	0-	0-16

Effective date: 09/14/2026

Beckman

Units: mcmol/L

Female		Male		Unknown
Age	Range	Age	Range	Age	Range
0-19y	0.0-15.0	0-19y	0.0-15.0
20y-59y	4.6-12.5	20y-59y	6.2-15.0
60y-	6.2-15.0	60y-

Effective date: 08/31/2026

Ordering & Collection

Specimen Type

Blood

Collection

All Locations:

Collection: 3 mL blood in LAVENDER TOP or LIME GREEN PST tube

Note: Chill tube on wet ice before drawing blood and put on wet ice after collection for immediate transport to lab.

Handling Instructions

Send to Laboratory on wet ice IMMEDIATELY after draw

If immediate centrifugation is not possible, keep collected blood specimens on ice and centrifuge in Refrigerated Centrifuge. within 1 hour.

Stability: 4 days at 15–25 °C; 4 weeks at 2–8 °C; 10 months at −20 °C.

Quantity

Requested: 1 mL plasma
Minimum: 0.5 mL plasma

Processing

Receiving Instructions

Misc Sendout

Performance

Lab Department

Chemistry, Automated Panels(CHA)

Frequency

Daily

Available STAT?

No

Performing Location(s)

CL	Renton Core Lab 206-520-4600 Clinical Lab, Room 170 1601 Lind Ave SW Renton, WA 98057

Billing & Coding

CPT Codes

83090

LOINC

13965-9

Interfaced Order Code

UOW1686

Interfaced Result Code

UOW1686