WHY ARE SOME COVID-19 TEST INCONCLUSIVE?
No test is 100% accurate If your swab test comes back positive for covid-19 then we can be very confident that you do have covid-19 However, people with covid-19 can be missed by these swab tests. If you have strong symptoms of covid-19, it is safest to self-isolate, even if the swab test does not show covid-19. RT - PCR test is positive and most reliable in most cases - but in 20 - 25 % cases - it can be false negative. There are many reasons like 1.low viral load 2.A high CT value - cycle threshold value 3.Inadequacy of the naso - pharyngeal swab specimen 4.Inexperienced and tired - technitian. In Covid antigen test - it is positive in only approximately 50 % cases as the viral load needs to be high for the specimen to be positive. Now - a days - even if the RT - PCR test is negative- but patient is having clinical symptoms of Covid-19- and Oxygen saturation is less than 95 % - we are relying on HRCT chest for the diagnosis with CORADS score of 4 and 5 taken as a strong possibility of COVID-19 disease
WHEN ONE OF THE THE TWO TARGETS BUT NOT BOTH.. PRESENT ..ABOVE THE THRESHOLD FOR POSITIVITY .. THE TEST IS REPORTED..INCONCLUSIVE.. THIS IS USUALLY SEEN WITH LOW AMOUNTS OF VIRAL DNA..
RT PCR test has 30 % false negative rate in diagnosis of Covid 19 That is 30% of all people who actually have Covid 19, will be tested negative That is inherent deficiency in the test Covid antigen test, the false negative rate goes up to 50%
Cases that would interest you
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51 year old female presents with red rash on bilateral lower extremities. Pt also presented with swollen feet/ankles with +4 putting edema. Pt states the swelling gets worse progressively throughout the day and is the worst at night but improves upon waking. Pt states she is tired most of the time and has shortness of breath upon exertion. Pt has a history of a hypertensive crisis that required a hospitalization. Pt takes Losartan and Amplodipine daily to control her hypertension. What is your diagnosis?
Dr. Manmeet Singh3 Likes23 Answers - Login to View the image
a 9 months baby having facial eruptions since 2months with no abdominal pain
Dr. Somesh2 Likes21 Answers - Login to View the image
65yrs old female known Paan chewer but not tobacco at all... from a poor family... c/o- an irregular growth over palate since last 3 to 4 months... its growth was steady in 1st month but now stopped growing since last 2 months... no history of DM HTN or any major diseases till date... no history of fever or lymhadenopathy.. o/E.. using gloves.. its consistency is soft.. it is totally painless... after pressing hard u can mildly feel hard palate... Send to an expert ENT surgeon at CIVIL hospital for biopsy.. waiting for results... My diagnosis is Tori Palatinous... or palatinal tori..mostl benign in nature... needs surgical removal... what do u say friends...??
Dr. Sushant Revadekar18 Likes80 Answers - Login to View the image
7 yr male child brought with c/o itching on the trunk and on the legs since 5 days.. itching more at night.. no fever.. no similar complaints in the family .
Dr. Venkat Reddy1 Like20 Answers - Login to View the image
9y, Female child brought to Emergency department with C/O accidental fall of hot oil over hands &abdomen. Vitals are normal. Suggest further management plz.
Dr. P Kartheek Reddy3 Likes22 Answers