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Uptodate Reference Title

Calculator: Michigan Risk Score (MRS) for PICC-related thrombosis in hospitalized nonpregnant adults

Another central venous catheter present at the time of PICC placement?
		Yes (1 point)
		No (0 points)
WBC >12.0 X 10³/microL [12.0 X 10⁹/L]?
		Yes (1 point)
		No (0 points)
Number of lumens in the PICC?
		1 lumen (0 points)
		2 lumens (2 points)
		3 to 4 lumens (3 points)
History of VTE
		Never (0 points)
		Yes, >30 days prior (2 points)
		Yes, within 30 days (3 points)
Active cancer: treated with chemotherapy or by hospitalization
		Yes (2 points)
		No (0 points)

Important: Inputs must be complete to perform calculation.

Total criteria point count:

MRS interpretation

Total points	Risk class	Probability (%) VTE if PICC inserted
0	I	0.9%
1 to 2	II	1.6%
3 to 4	III	2.7%
5 to 10	IV	4.7%

Notes

The MRS for PICC-related thrombosis in hospitalized nonpregnant adults has not been validated in surgical patients nor in patient undergoing surgery with a PICC.
PICC: peripherally inserted central catheter; WBC: white blood cell count; VTE: venous thromboembolism.

References

Chopra V, Smith S, Swaminathan L, et al. Variations in peripherally inserted central catheter use and outcomes in Michigan hospitals. JAMA Intern Med 2016; 176:548.
Chopra V, Kaatz, S, Conlon A, et al. The Michigan Risk Score to predict peripherally inserted central catheter-associated thrombosis. J Thromb Haemost 2017; 15:1951.

Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

Legal Notices and Disclaimer

All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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