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Test Code Caffeine Caffeine Level

Clinical System Name

Caffeine Level


Caffeine Level

Sample Requirements

Specimen: Whole Blood

Container(s): Dark Green/Sodium Heparin or Red or Gold SST

Preferred Vol: 1.0 mL

Minimum Vol: 0.2 mL


Note: Trough levels preferred. Serum/plasma must be removed from gel SST within 24 hours of collection.

Processing Instructions

Reject due to:

Spin: Y

Aliquot: Y

Temp: 2 - 4 C

Storage location: Aliquot 0.1 - 0.5 mL serum. This test is always STAT. When a Send Outs team member is present, notify them IMMEDIATELY, otherwise IMMEDIATELY send sample directly to HMC via Delivery Express.


Off-site collection:


Specimen Type Temperature Time
  Room temp  



STAT Performed TAT
Y Daily 1 d


Performing Laboratory

Harborview Medical Center


Harborview Medical Center

Room GWH47; 325 9th Ave
Seattle, WA 98104

Phone Number: (206) 744-3451


Reference Range


  Females (mcg/mL) Males (mcg/mL)
0 - 18 yrs 5 - 20 5 - 20
19 yrs - 5 - 15 5 - 15



Method: EMIT

Analytical Volume: None specified


CPT Codes



Send Out Instructions


Reference Test Name: CAFFEINE
Reference Test Number: CAFQN
Instructions: This test is always STAT. Send all STATS to HMC via Delivery Express. Keep a copy of the batch sheet for our lab records.