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More about Cq values and virus test results

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The “Cq” in Cq value stands for “Cycle quantification”. It is a number that indicates when (or in which cycle of processing) the virus was detected in your sample. 

Using your Cq number and some control sample data for the test, the test manufacturer can calculate an overall ‘detected', ‘not detected' or ‘inconclusive' result.  This logic varies depending on the manufacturer of your test: you can find this in the ‘Test name' field of your result details.

Test Name

Virus Detected

Virus Not Detected

Virus Inconclusive - Sample

Inconclusive - Test Run

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FRANKD

5 <= Cq value <= 30

(Cq value is between 5 and 30 inclusive)

0 <= Cq value < 5 (Cq value is greater or equal to 0 AND less than 5); OR

Cq value empty

 NA
  1. Cq value < 0 (Cq is less than 0); OR
  2. Cq value > 30 (Cq is more than 30); OR
  3. Control sample -ve != 0 (the negative control sample does not equal 0); OR
  4. Control sample -ve != empty (the negative control sample is not empty); OR
  5. Control sample +ve = empty (the positive control sample is empty); OR
  6. Control sample +ve > 30 (the positive control sample is over 30); OR
  7. Control sample +ve < 1 (the positive control sample is less than 1)

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SAVD

0< Cq value <=30


(Cq value is greater than 0 AND less than or equal to 30)

 Cq value "NaN" OR Cq value = 0 NA
  1. Cq value < 0 (Cq is less than 0); OR
  2. Cq value > 30 (Cq is more than 30); OR
  3. Control sample -ve != 0 (the negative control does not equal 0); OR
  4. Control sample -ve != "NaN" (the negative control sample is not NaN); OR
  5. Control sample +ve = 0 (the positive control sample is 0); OR
  6. Control sample +ve = "NaN" (the positive control sample is NaN); OR
  7. Control sample +ve >= 30 (the positive control sample is more than 30); OR
  8. Control sample +ve <= 1 (the positive control sample is less than or equal to 1)

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PROmate

BOTH


Cq value > 0

(Cq value is more than 0) 


AND


Cq value (HEX) =>0

(the Cq HEX value is greater than or equal to 0)

BOTH


Cq value = 0 (Cq value is 0) 


AND


1< Cq value (HEX) <22

(Cq HEX value is more than 1 but less than 22)

BOTH


Cq value = 0 (Cq value is 0)


AND 


0 <= Cq value (HEX) <= or

Cq value (HEX) > 22 (the Cq HEX value is between 0 and 1 inclusive, or it is above 22)
  1. Control sample -ve > 0 (the negative control sample is more than 0. In this case the related HEX Cq value can be ignored); OR
  2. Control sample +ve <14 or Control sample +ve > 25 (positive control sample is less than 14 or more than 25. In this case the related HEX Cq value can be ignored); OR 
  3. Control sample -ve (HEX) = 0 (the negative control sample is 0. In this case the related Cq value can be ignored)
  4. BOTH
    1. Control sample +ve = 0 (positive control sample is 0); AND
    2. Control sample +ve (HEX)  >= 22 (positive control sample HEX is equal to or above 22)
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