Routine Broad-Range Fungal Polymerase Chain Reaction With DNA Sequencing in Patients With Suspected Mycoses Does Not...

Area of Science:

• Medical diagnostics
• Molecular biology
• Mycology

Background:

• New molecular diagnostic tests are frequently introduced, often presumed to be superior to traditional methods.
• Evaluating the cost-effectiveness and clinical utility of these advanced tests is crucial for patient care.

Purpose of the Study:

• To compare the diagnostic value and cost of broad-range polymerase chain reaction (PCR) and DNA sequencing for fungal infections against traditional diagnostic studies.
• To assess the clinical impact and cost-effectiveness of molecular fungal diagnostics.

Main Methods:

• A retrospective review of 65 specimens was conducted.
• Compared broad-range fungal PCR/DNA sequencing with direct fungal examination, fungal culture, and histopathologic assessment.
• Analyzed sensitivity, specificity, predictive values, and overall costs for each method.

Main Results:

• Broad-range fungal PCR/DNA sequencing demonstrated comparable sensitivity and specificity to traditional methods, except for a lower positive predictive value (62.5%) and three false-positives.
• The cost for broad-range fungal PCR/DNA sequencing was $32,500 for 65 specimens, substantially higher than the $8,591.70 combined cost of traditional tests.
• No fungal pathogens were exclusively identified by PCR/DNA sequencing that were missed by traditional methods.

Conclusions:

• Broad-range fungal PCR/DNA sequencing is not a substitute for traditional laboratory diagnostic studies for fungal infections.
• The higher cost and lack of unique diagnostic yield suggest judicious use of this molecular test.
• Careful consideration of cost and clinical value is essential for implementing new diagnostic technologies.