{"id":3026,"date":"2026-10-03T16:08:47","date_gmt":"2026-10-03T16:08:47","guid":{"rendered":"https:\/\/nhdbio.com\/?p=3026"},"modified":"2026-10-15T03:53:29","modified_gmt":"2026-10-15T03:53:29","slug":"limites-de-deteccion-y-cuantificacion-de-coa-de-peptido-no-detectado","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/es\/peptide-coa-not-detected-detection-quantitation-limits\/","title":{"rendered":"\u201cNo detectado\u201d no es cero: entienda los l\u00edmites de detecci\u00f3n y cuantificaci\u00f3n"},"content":{"rendered":"<p>A report says \u201cnot detected.\u201d Can you write that the sample contains none of that substance? Not quite. Every method has a limit to what it can see and measure. The report needs to tell you that limit.<\/p>\n<h2>Ver algo y medirlo con exactitud son cosas diferentes<\/h2>\n<p>El l\u00edmite de detecci\u00f3n se refiere a si una sustancia a nivel bajo puede ser identificada por el m\u00e9todo. El l\u00edmite de cuantificaci\u00f3n se refiere a si su cantidad puede ser medida con un desempe\u00f1o adecuado. Una se\u00f1al d\u00e9bil puede ser reconocible antes de que su cantidad sea fiable.<\/p>\n<p>Un l\u00edmite de reporte puede ser definido por separado por el procedimiento. Pregunta qu\u00e9 l\u00edmite usa realmente el informe.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t17\/en\/1.png\" alt=\"Figure 1. Detection and quantitation are different questions.\"><figcaption>Figura 1. La detecci\u00f3n y la medici\u00f3n fiable de la cantidad responden a preguntas diferentes.<\/figcaption><\/figure>\n<h2>Sigue un ejemplo de bajo a alto<\/h2>\n<p>In this teaching example, the detection limit is about 0.2 \u00b5g\/g and the quantitation limit is 0.6 \u00b5g\/g. Below the detection capability, presence cannot be reliably established by these rules.<\/p>\n<p>Por encima de la detecci\u00f3n pero por debajo de 0.6, puede haber evidencia de presencia sin una cantidad num\u00e9rica fiable. En el rango cuantitativo establecido, el m\u00e9todo puede respaldar un resultado de cantidad.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t17\/en\/2.png\" alt=\"Figure 2. Illustrative thresholds: below detection, detected below quantitation, and within a supported quantitative range.\"><figcaption>Figure 2. Example detection and quantitation limits of 0.2 and 0.6 \u00b5g\/g.<\/figcaption><\/figure>\n<h2>\u00bfEl l\u00edmite responde a su requisito?<\/h2>\n<p>Suppose you require less than 0.1 \u00b5g\/g, but the result only supports less than 0.2 \u00b5g\/g. It does not settle whether the sample meets the stricter requirement.<\/p>\n<p>Ambos n\u00fameros pueden parecer peque\u00f1os. La diferencia entre ellos sigue siendo importante. Compare la misma sustancia, unidades y base de muestra.<\/p>\n<h2>A blank box is not \u201cnot detected\u201d<\/h2>\n<p>A blank field may mean no result was supplied. \u201cNot tested\u201d means the test was not performed. \u201cNot detected\u201d describes an outcome under a method\u2019s reporting rules. None automatically means an exact zero.<\/p>\n<p>Un 0.000 mostrado tambi\u00e9n puede estar redondeado o procesado. Pregunte c\u00f3mo se gener\u00f3 antes de tratarlo como un valor exacto.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t17\/en\/3.png\" alt=\"Figure 3. Report ND with the method, unit and reporting threshold.\"><figcaption>Figure 3. Read \u201cnot detected\u201d together with the method, unit and reporting limit.<\/figcaption><\/figure>\n<h2>Haga una pregunta completa<\/h2>\n<p>Pregunte: \u00bfqu\u00e9 sustancia se analiz\u00f3, mediante qu\u00e9 m\u00e9todo, en qu\u00e9 unidades y con qu\u00e9 l\u00edmite de notificaci\u00f3n? Las pruebas de endotoxinas y disolventes residuales, por ejemplo, investigan sustancias diferentes.<\/p>\n<div class=\"exercise\"><strong>A report states less than 1 \u00b5g\/g. Does that establish less than 0.5 \u00b5g\/g?<\/strong><\/p>\n<details>\n<summary>Ver la respuesta<\/summary>\n<p>No. The range from 0.5 to 1 \u00b5g\/g has not been excluded.<\/p>\n<\/details>\n<\/div>\n<h2>Solicitud de resultados para LL-37 o GHK-Cu<\/h2>\n<p>Para LL-37 o GHK-Cu, indique la sustancia que desea medir y la capacidad de notificaci\u00f3n que necesita. Confirme qu\u00e9 pruebas se realizaron realmente. La pureza por HPLC no proporciona un resultado de endotoxinas.<\/p>\n<p><a href=\"https:\/\/nhdbio.com\/es\/productos\/ll-37\/\">LL-37<\/a> \/ <a href=\"https:\/\/nhdbio.com\/es\/productos\/ghk-cu\/\">GHK-Cu<\/a><\/p>\n<p><a href=\"https:\/\/nhdbio.com\/es\/cita\/\">Consulte sobre requisitos de material y documentaci\u00f3n con NHD<\/a> \u00b7 <a href=\"https:\/\/nhdbio.com\/es\/metodos-analiticos\/como-leer-el-certificado-de-analisis-de-un-peptido\/\">Contin\u00fae con la gu\u00eda anal\u00edtica<\/a><\/p>\n<footer><strong>Fuentes y notas de ejemplo<\/strong><\/p>\n<p>Los n\u00fameros y las curvas son ejemplos did\u00e1cticos, no resultados de an\u00e1lisis de lotes de producto. Fuentes consultadas el 11 de octubre de 2026.<\/p>\n<ul>\n<li><a href=\"https:\/\/database.ich.org\/sites\/default\/files\/ICH_Q2(R2)_Guideline_2023_1130_ErrorCorrection_2025.pdf\">ICH Q2(R2) \u00b7 analytical validation<\/a><\/li>\n<\/ul>\n<p>Redacci\u00f3n y revisi\u00f3n de fuentes asistidas por IA. Los materiales del cat\u00e1logo son para investigaci\u00f3n, desarrollo y fabricaci\u00f3n, no para uso humano o veterinario.<\/p>\n<\/footer>","protected":false},"excerpt":{"rendered":"<p>Aprenda qu\u00e9 le dice \u201cno detectado\u201d y qu\u00e9 n\u00famero a\u00fan necesita.<\/p>","protected":false},"author":1,"featured_media":3054,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pim_family_ids":"318,344","pim_article_type":"Peptide buying and basics","pim_evidence_level":"Technical references and clearly labeled examples","pim_reviewer":"AI-assisted source and editorial check","pim_reviewed_date":"2026-10-11","pim_editorial_note":"Reference data and teaching examples are separated from NHD lot results; product specifications and availability require confirmation.","pim_review_status":"reviewed","pim_review_reason":"Teaching examples, arithmetic, source links and plain language checked; product enquiries linked.","pim_creation_method":"AI-assisted drafting, source checks, translation and generated comic illustration. This is not independent peer review or supplied-lot verification.","pim_sources":"[{\"title\":\"ICH Q2(R2): Validation of Analytical Procedures\",\"note\":\"International Council for Harmonisation. Step 4, adopted November 2023; error-corrected 2025.\",\"url\":\"https:\/\/database.ich.org\/sites\/default\/files\/ICH_Q2%28R2%29_Guideline_2023_1130_ErrorCorrection_2025.pdf\"},{\"title\":\"Teaching reference \u2014 database.ich.org \u2014 ICH_Q2(R2)_Guideline_2023_1130_ErrorCorrection_2025.pdf\",\"note\":\"\",\"url\":\"https:\/\/database.ich.org\/sites\/default\/files\/ICH_Q2(R2)_Guideline_2023_1130_ErrorCorrection_2025.pdf\"},{\"title\":\"ICH Q2(R2) Validation of Analytical Procedures\",\"note\":\"ICH Q2(R2) Validation of Analytical Procedures\",\"url\":\"https:\/\/www.ema.europa.eu\/en\/scientific-guidelines\/ich-q2r2-validation-analytical-procedures\"}]","footnotes":""},"categories":[20],"tags":[],"class_list":["post-3026","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-evidence-quality-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u201cNot Detected\u201d Is Not Zero: Read Detection and Quantitation Limits | NHD<\/title>\n<meta name=\"description\" content=\"Learn what \u201cnot detected\u201d tells you, and what number you still need.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nhdbio.com\/es\/limites-de-deteccion-y-cuantificacion-de-coa-de-peptido-no-detectado\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u201cNot Detected\u201d Is Not Zero: Read Detection and Quantitation Limits\" \/>\n<meta property=\"og:description\" content=\"Learn what \u201cnot detected\u201d tells you, and what number you still need.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nhdbio.com\/es\/limites-de-deteccion-y-cuantificacion-de-coa-de-peptido-no-detectado\/\" \/>\n<meta property=\"og:site_name\" content=\"NHD\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-03T16:08:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-15T03:53:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/nhdbio.com\/wp-content\/uploads\/2026\/10\/limits-cover-1024x683.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"683\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"NHD Technical Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"Peptide Raw Materials and Custom Peptide Synthesis\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"NHD Technical Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-coa-not-detected-detection-quantitation-limits\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-coa-not-detected-detection-quantitation-limits\\\/\"},\"author\":{\"name\":\"NHD Technical Team\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#\\\/schema\\\/person\\\/0ffb0dec7fda0f720073fc468fac6fc1\"},\"headline\":\"\u201cNot Detected\u201d Is Not Zero: Read Detection and Quantitation Limits\",\"datePublished\":\"2026-10-03T16:08:47+00:00\",\"dateModified\":\"2026-10-15T03:53:29+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-coa-not-detected-detection-quantitation-limits\\\/\"},\"wordCount\":469,\"publisher\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-coa-not-detected-detection-quantitation-limits\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/nhdbio.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/limits-cover.png\",\"articleSection\":[\"Evidence &amp; 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