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COVID-19 Symptom-Based C19 Rule for Diagnosis

 

Symptoms
		Loss of taste or smell (2 points)
		Cough and fever (1 point)
		Chest tightness or wheezing (-1 point)

 
Important: Inputs must be complete to perform calculation.

 

Total Criteria Point Count:
 
     
 
Include literature references: Yes   No
 

C19 Rule Interpretation

 

3 points:	LR+ 15 for diagnosis of COVID-19
2 points:	LR+ 4.2 for diagnosis of COVID-19
1 point:	LR+ 1.2 for diagnosis of COVID-19
0 points:	LR+ 0.7 for diagnosis of COVID-19
-1 points:	LR+ 0.1 for diagnosis of COVID-19

 

Notes

• When the odds (by prevalence) of COVID-19 is known, these odds may be mutiplied by the calculated LR+ to obtain the post-test odds of COVID-19 in individuals with the symptoms above.
• LR+: likelyhood ratio of a positive test.

 

References

1. Smith DS, Richey EA, Brunetto WL. A Symptom-Based Rule for Diagnosis of COVID-19. SN Compr Clin Med. 2020 Oct 24:1-8. PubMed ID: 33134843