mpn-lookup

A simple tool for when you don't want to use, or simply can't find, the various reference PDF's for the QuantiTray system.

Built with:

For the work I used the following tools:

Installation

npm install mpn-lookup
# or
pnpm add mpn-lookup
# or
yarn add mpn-lookup

Quick Start

import { getQtMpn, getQt2KMpn, getQtLegio } from 'mpn-lookup';

// Standard QuantiTray lookup (0-51 positive wells)
const result = getQtMpn(10);
if (result) {
  const [lower, estimate, upper] = result;
  console.log(`MPN: ${estimate} (${lower} - ${upper})`);
  // Output: MPN: 5.3 (2.3 - 12.3)
}

// QuantiTray 2000 lookup (large pos: 0-49, small pos: 0-48)
const result2k = getQt2KMpn(10, 25);
if (result2k) {
  const [lower, estimate, upper] = result2k;
  console.log(`2K MPN: ${estimate} (${lower} - ${upper})`);
}

// Legionella lookup (large pos: 0-6, small pos: 0-90)
const legioResult = getQtLegio(3, 45);
if (legioResult !== undefined) {
  console.log(`Legionella MPN: ${legioResult}`);
}

API Reference

getQtMpn(positiveWells: number): MpnResult | undefined

Returns MPN values for standard QuantiTray testing.

• positiveWells: Number of positive wells (0-51)
• Returns: [lowerBound, estimate, upperBound] tuple or undefined for invalid inputs

getQt2KMpn(largePos: number, smallPos: number): MpnResult | undefined

Returns MPN values for QuantiTray 2000 high-throughput testing.

• largePos: Large position index (0-49)
• smallPos: Small position index (0-48)
• Returns: [lowerBound, estimate, upperBound] tuple or undefined for invalid inputs

getQtLegio(largePos: number, smallPos: number): string | number | undefined

Returns MPN values for Legionella testing.

• largePos: Large position index (0-6)
• smallPos: Small position index (0-90)
• Returns: Single MPN value or undefined for invalid inputs

Development

# Clone and setup
git clone https://github.com/jonathan-gartland/mpn-lookup.git
cd mpn-lookup
pnpm install

# Run tests
pnpm test

# Build library
pnpm build

# Run all checks (lint, type-check, test)
pnpm run check-all

Example use in REPL:

Example Apps that uses the mpn-lookup library

https://github.com/jonathan-gartland/mpn-lookup-nextjs
https://github.com/jonathan-gartland/MpnLookupRN