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Test Code LAB1998 Specific Gravity, Urine

Clinical System Name

Urine Specific Gravity

Synonyms

SG Urine

SG U

LAB1998

Sample Requirements

Specimen: Urine

Container(s): Sterile, screw-capped container preferred. Clean container also acceptable.

Preferred Vol: 1.0 mL fresh random urine

Minimum Vol: 0.5 mL

 

Notes:

For bagged urines: Aspirate urine sample from bag using a sterile needleless syringe and place in sterile specimen cup before sending to the lab.

For non-sterile containers: Urines collected in non-sterile containers will not be sent for culture. They will have the following comment appended: “Urine collected into a non-sterile container. Results may be affected due to unknown interferents, and sample is unsuitable for culture. For future collections please collect urine into a sterile specimen cup.”

 

Acceptable collection methods: bagged, bladder tap, bladder wash, clean catch, cystoscopy, direct catheter, foley catheter, lleal loop, indwelling catheter, kidney, midstream void, nephrostomy, supra, suprapubic asp, ureter.

Processing Instructions

Reject due to:  Insufficient quantity, incorrect storage temperature, age of specimen

Spin: Y

Aliquot: Y

Storage location: Core Chemistry Refrigerator

 

Off-site collection:  Deliver specimen to the Lab within one hour of collection or keep refrigerated at 2-8oC.

Stability

Specimen Type Temperature Time
Urine RT

≤ 2 h

Urine 2-8 C

≤ 10 h

  -20 C or -70 C

N

Availability

STAT Performed TAT
Y 24/7  1 h

Performing Laboratory

Seattle Children's Laboratory    

Department

Department:  Core Chemistry

Phone Number: 206-987-2617 (Client Services)

CPT Codes

81002

Methodology

Method: Atago Refractometer

Analytical Volume: 0.2 mL

Reference Range

1.001 - 1.035