---
title: "Calculate comprehensive formant statistics with gender-specific validation and clinical interpretation"
method: GET
path: "/api/calculate-formant-statistics"
tags: ["Advanced Voice Analysis"]
---

# Calculate comprehensive formant statistics with gender-specific validation and clinical interpretation

`GET /api/calculate-formant-statistics`

## Request

- Base URL: `https://platform.vocametrix.com`
- URL: `https://platform.vocametrix.com/api/calculate-formant-statistics`
- Auth: API key in header `X-API-Key`

## Query parameters

- `svFileId` string, required
- `age` integer, required
- `gender` 1 | 2 | 3, required
- `version` string

## Response `200`

Successful response

- object
  - `F1_MEAN` number: Mean first formant frequency in Hz. Example: 685.4
  - `F1_STD` number: F1 standard deviation in Hz. Example: 45.2
  - `F1_CV` number: F1 coefficient of variation in %. Example: 6.6
  - `F1_MEDIAN` number: F1 median frequency in Hz. Example: 682.1
  - `F1_IQR` number: F1 interquartile range in Hz. Example: 38.7
  - `F1_RANGE` number: F1 frequency range in Hz. Example: 142.5
  - `F2_MEAN` number: Mean second formant frequency in Hz. Example: 1247.8
  - `F2_STD` number: F2 standard deviation in Hz. Example: 78.3
  - `F2_CV` number: F2 coefficient of variation in %. Example: 6.3
  - `F2_MEDIAN` number: F2 median frequency in Hz. Example: 1245.6
  - `F2_IQR` number: F2 interquartile range in Hz. Example: 65.1
  - `F2_RANGE` number: F2 frequency range in Hz. Example: 234.8
  - `F3_MEAN` number: Mean third formant frequency in Hz. Example: 2856.1
  - `F3_STD` number: F3 standard deviation in Hz. Example: 112.4
  - `F3_CV` number: F3 coefficient of variation in %. Example: 3.9
  - `F3_MEDIAN` number: F3 median frequency in Hz. Example: 2851.7
  - `F3_IQR` number: F3 interquartile range in Hz. Example: 89.3
  - `F3_RANGE` number: F3 frequency range in Hz. Example: 387.2
  - `F4_MEAN` number: Mean fourth formant frequency in Hz. Example: 3847.5
  - `F4_STD` number: F4 standard deviation in Hz. Example: 145.7
  - `F4_CV` number: F4 coefficient of variation in %. Example: 3.8
  - `F4_MEDIAN` number: F4 median frequency in Hz. Example: 3842.9
  - `F4_IQR` number: F4 interquartile range in Hz. Example: 123.8
  - `F4_RANGE` number: F4 frequency range in Hz. Example: 512.6
  - `F2_F1_DIFF` number: F2-F1 frequency difference in Hz. Example: 562.4
  - `F3_F2_DIFF` number: F3-F2 frequency difference in Hz. Example: 1608.3
  - `F4_F3_DIFF` number: F4-F3 frequency difference in Hz. Example: 991.4
  - `VOWEL_SPACE_DISTANCE` number: Distance from neutral vowel in Hz. Example: 234.6
  - `FORMANT_STABILITY_INDEX` number: Mean coefficient of variation of F1-F3, in %; lower means more stable. Example: 5.8
  - `ARTICULATORY_PRECISION` string: Clinical precision level. Example: "Good articulatory precision"
  - `PRECISION_LEVEL` string: Severity classification. Example: "Normal precision"
  - `VOWEL_QUALITY` string: Gender-specific assessment. Example: "Normal female vowel production"
  - `GENDER` string: Gender classification. Example: "Female"
  - `VOICE_PATTERN` string: Clinical pattern assessment. Example: "Normal formant pattern"
  - `PATIENT_AGE` integer: Patient age in years. Example: 35
  - `PATIENT_GENDER` string: Patient gender classification. Example: "Female"
  - `AGE_GROUP` string: Age-based grouping. Example: "Young Adult"
  - `AGE_NOTE` string: Age-related clinical note. Example: "Age within normal vocal range"
  - `GENDER_FORMANT_NOTE` string: Gender-specific formant note. Example: "Formant frequencies consistent with female anatomy"
  - `EXPECTED_F1_RANGE` string: Expected F1 range for demographics. Example: "650-720 Hz"
  - `EXPECTED_F2_RANGE` string: Expected F2 range for demographics. Example: "1200-1300 Hz"
  - `EXPECTED_F3_RANGE` string: Expected F3 range for demographics. Example: "2800-2900 Hz"

## Other responses

- `400`: Bad request — missing or invalid parameter
- `401`: Unauthorized — missing or invalid API key
- `429`: Rate limit exceeded
- `500`: Server error

---

[API](https://skmtc.dev/vocametrix/apis/vocametrix-api.md) · [All operations](https://skmtc.dev/vocametrix/apis/vocametrix-api/llms.txt) · [OpenAPI document](https://skmtc.dev/vocametrix/apis/vocametrix-api/revisions/8a54d01bcc81?raw)