Pure Tone Average Calculator for Adults

Pure Tone Average Formula:

\[ PTA = \frac{F_1 + F_2 + F_3}{3} \]

PTA: Pure tone average (dB)
F₁, F₂, F₃: Hearing thresholds at frequencies (dB)

Pure Tone Average (dB):

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1. What is Pure Tone Average (PTA)?

Definition: PTA is the average of hearing threshold levels at specific frequencies, typically used to quantify hearing loss.

Purpose: It provides a single-number estimate of hearing sensitivity and helps classify degree of hearing impairment.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ PTA = \frac{F_1 + F_2 + F_3}{3} \]

Where:

\( PTA \) — Pure tone average (dB HL)
\( F_1, F_2, F_3 \) — Hearing thresholds at test frequencies (dB HL)

Explanation: The average is calculated by summing the thresholds at three frequencies and dividing by three.

3. Importance of PTA Calculation

Details: PTA is crucial for diagnosing hearing loss severity, determining hearing aid candidacy, and monitoring hearing changes over time.

4. Using the Calculator

Tips: Enter hearing thresholds (in dB HL) for three frequencies (typically 500Hz, 1000Hz, and 2000Hz). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: Which frequencies are typically used?
A: The standard PTA uses 500Hz, 1000Hz, and 2000Hz, but some protocols may use different combinations.

Q2: What does the PTA result indicate?
A: PTA ≤ 25dB = normal hearing; 26-40dB = mild; 41-55dB = moderate; 56-70dB = moderately-severe; 71-90dB = severe; >90dB = profound.

Q3: Why average three frequencies?
A: Averaging provides a more stable representation of hearing across the speech frequency range than single frequency measures.

Q4: Can I use this for children?
A: While the calculation is the same, interpretation differs for children who should have thresholds ≤15dB.

Q5: How accurate is PTA for hearing loss?
A: PTA is a screening measure; comprehensive audiological evaluation provides more complete information.