diff --git a/lib/core/util.js b/lib/core/util.js
index 5a28529b663..d221e98673b 100644
--- a/lib/core/util.js
+++ b/lib/core/util.js
@@ -334,19 +334,11 @@ function isDisturbed (body) {
 }
 
 function isErrored (body) {
-  return !!(body && (
-    stream.isErrored
-      ? stream.isErrored(body)
-      : /state: 'errored'/.test(nodeUtil.inspect(body)
-      )))
+  return !!(body && stream.isErrored(body))
 }
 
 function isReadable (body) {
-  return !!(body && (
-    stream.isReadable
-      ? stream.isReadable(body)
-      : /state: 'readable'/.test(nodeUtil.inspect(body)
-      )))
+  return !!(body && stream.isReadable(body))
 }
 
 function getSocketInfo (socket) {
@@ -411,20 +403,6 @@ function isFormDataLike (object) {
   )
 }
 
-function throwIfAborted (signal) {
-  if (!signal) { return }
-  if (typeof signal.throwIfAborted === 'function') {
-    signal.throwIfAborted()
-  } else {
-    if (signal.aborted) {
-      // DOMException not available < v17.0.0
-      const err = new Error('The operation was aborted')
-      err.name = 'AbortError'
-      throw err
-    }
-  }
-}
-
 function addAbortListener (signal, listener) {
   if ('addEventListener' in signal) {
     signal.addEventListener('abort', listener, { once: true })
@@ -495,7 +473,6 @@ module.exports = {
   getSocketInfo,
   isFormDataLike,
   buildURL,
-  throwIfAborted,
   addAbortListener,
   parseRangeHeader,
   nodeMajor,