Ordering Recommendation

May aid in the evaluation of lung inflammation or injury in various types of ILD.

KL 6

Quantitative Immunoturbidimetric




1-8 days

New York DOH Approval Status
Specimens from New York clients will be sent out to a New York DOH approved laboratory, if possible.
Specimen Required
Patient Preparation

Plain Red

Specimen Preparation

Allow specimen to clot completely at room temperature. Separate from cells ASAP or within 2 hours of collection. Transfer 1.5 mL serum to ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature


Unacceptable Conditions

Hemolyzed, hyperlipemic, icteric, heat-treated or contaminated.


Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 month

Reference Interval

0-500 U/mL

Interpretive Data

Krebs von den Lungen-6 (KL-6) is an indicator of lung inflammation or damage. Elevated levels are associated with various types of interstitial lung diseases (ILD).

Abnormal KL-6 results should be interpreted in the appropriate clinical context. A negative result does not rule out ILD.

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.

Compliance Category

Laboratory Developed Test (LDT)


Samples with results greater than 10,000 U/mL will be diluted to the maximum reportable range (>40,000 U/mL).

Hotline History
CPT Codes


Component Test Code* Component Chart Name LOINC
3001867 Krebs von den Lungen-6 93369-7
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • KL 6
  • KL6
Krebs von den Lungen-6