von Willebrand Factor Activity (Ristocetin Cofactor) : ARUP Lab Tests

Home | Contact | Careers | ARUP Connect™ Login | ARUP Events

Laboratory Test Directory

Test Directory | Entire Site

Search Tips

Wildcards Symbol (*)

The wildcard symbol (*) can be used in place of letters or characters in query words to search for different permutations of a word.

*	Can be in any position in the term and matches any number of characters.
Examples:	hemo*	matches hemolytic, hemophilia and hemophilia
	*NA	matches DNA and RNA
	*tet**	matches text and test
	BCL*	matches bcl-1/JH and bcl-2/JH
	virus*	matches virus or viruses
	*glucan*	matches beta-1,3-d-Glucan

Boolean Parameters

Search terms can be a single word or several words. The search engine automatically inserts and between words if nothing else is specified, so the Boolean term and can be omitted in search terms. For example, searching for tissue assay is the same as searching for tissue AND assay.

Quotes can be used to search for phrases. For example:

"tissue assay "

Words must be present in the specified order with no intervening words

The following boolean connectors can be used: AND, OR, NOT Examples:

tissue AND assay	Both words must be present
tissue OR assay	Either word can be present
assay NOT tissue	Only assay can be present, tissue cannot appear on the page

Testing Information

Testing Specialties

Specimen Handling

Client Services

Lab Expertise

Utilization Management

Research & Development

Education

About ARUP

ARUP's Laboratory Test Directory

von Willebrand Factor Activity (Ristocetin Cofactor) : 0030250

Mnemonic: RCF

Methodology:	Platelet Agglutination
Performed:	Mon-Sat
Reported:	1-3 days
Specimen Required:	Collect: Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines. Specimen Preparation: Transfer 2 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 1 mL) Storage/Transport Temperature: CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered. Unacceptable Conditions: Serum. Hemolyzed or non-frozen specimens. Stability (collection to initiation of testing): Ambient: 4 hours; Refrigerated: Unacceptable; Frozen: 2 weeks

Reference Interval: 0-6 years: 51-215% 7-9 years: 52-176% 10-11 years: 60-195% 12-13 years: 50-184% 14-15 years: 50-203 % 16-17 years: 49-204% 18 years and older: 51-215%
CPT Code(s):	85245
Cross References:	RCF, Ristocetin Cofactor, Plasma, von Willebrand Factor (vWF) Activity, von Willebrand Factor Antigen, Plasma

All ARUP Sites: www.aruplab.com · www.arupconsult.com · www.arup.utah.edu · www.childx.org · www.utahblood.org

ARUP® Laboratories &ndash National Reference Laboratory